Do not work for the food that perishes, but for the food that endures for eternal life, which the Son of Man will give you. For it is on him that God the Father has set his seal. John 6:27, assigned reading for Tuesday in the fourth week of Lent.
How do we "work" for the Bread of Life, which we receive in the Sacrament of the Holy Eucharist? This is what the Outline of the Faith in the Book of Common Prayer has to say:
Q. What is required of us when we come to the Eucharist?
A. It is required that we should examine our lives, repent of our sins, and be in love and charity with all people.
Not a bad day's work if we can be about it.